Re: vmsplice triggering bug in kfree.

[Eric Dumazet]

On Wed, 2012-06-06 at 22:51 -0400, Dave Jones wrote:
> kernel BUG at mm/slub.c:3474!
> invalid opcode: 0000 [#1] PREEMPT SMP 
> CPU 7 
> Modules linked in: ipt_ULOG tun fuse binfmt_misc nfnetlink caif_socket caif phonet bluetooth rfkill can llc2 pppoe pppox ppp_generic slhc irda crc_ccitt rds af_key decnet rose x25 atm netrom appletalk ipx p8023 psnap p8022 llc ax25 ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables kvm_intel kvm crc32c_intel ghash_clmulni_intel microcode usb_debug serio_raw pcspkr i2c_i801 e1000e nfsd nfs_acl auth_rpcgss lockd sunrpc i915 video i2c_algo_bit drm_kms_helper drm i2c_core [last unloaded: scsi_wait_scan]
> Pid: 21252, comm: trinity-child7 Not tainted 3.5.0-rc1+ #74
> RIP: 0010:[<ffffffff811945ce>]  [<ffffffff811945ce>] kfree+0x26e/0x270
> RSP: 0018:ffff880104065c48  EFLAGS: 00010246
> RAX: 0020000000000000 RBX: ffff880104065d18 RCX: 0000000000000000
> RDX: ffffffff7fffffff RSI: ffff880104065cf0 RDI: ffff880104065d18
> RBP: ffff880104065c78 R08: 00000000fffffff2 R09: 0000000000000000
> R10: ffffffff821e2d00 R11: 0000000000000001 R12: 0000000000000ffc
> R13: ffffea0004101940 R14: 0000000000000000 R15: ffff880104065d98
> FS:  00007f5baafd3740(0000) GS:ffff880148a00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000000000ffc CR3: 0000000107181000 CR4: 00000000001407e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Process trinity-child7 (pid: 21252, threadinfo ffff880104064000, task ffff8801080acd60)
> Stack:
>  0000000000000010 ffff880104065cf0 0000000000000ffc fffffffffffffff2
>  0000000000000000 ffff880104065d98 ffff880104065c98 ffffffff811dc9ef
>  0000000000000018 0000000000000161 ffff880104065ec8 ffffffff811dcc4c
> Call Trace:
>  [<ffffffff811dc9ef>] splice_shrink_spd+0x1f/0x30
>  [<ffffffff811dcc4c>] vmsplice_to_pipe+0x24c/0x290
>  [<ffffffff811db920>] ? page_cache_pipe_buf_release+0x30/0x30
>  [<ffffffff810b1e7e>] ? put_lock_stats.isra.23+0xe/0x40
>  [<ffffffff8164dee8>] ? _raw_spin_unlock_irqrestore+0x38/0x80
>  [<ffffffff8108cd97>] ? local_clock+0x47/0x60
>  [<ffffffff81078daa>] ? __hrtimer_start_range_ns+0x14a/0x530
>  [<ffffffff810b1ac8>] ? trace_hardirqs_off_caller+0x28/0xc0
>  [<ffffffff81078daa>] ? __hrtimer_start_range_ns+0x14a/0x530
>  [<ffffffff810b1e7e>] ? put_lock_stats.isra.23+0xe/0x40
>  [<ffffffff8164dee8>] ? _raw_spin_unlock_irqrestore+0x38/0x80
>  [<ffffffff8108cd97>] ? local_clock+0x47/0x60
>  [<ffffffff81050e0c>] ? do_setitimer+0x1cc/0x310
>  [<ffffffff810b1ac8>] ? trace_hardirqs_off_caller+0x28/0xc0
>  [<ffffffff81086f91>] ? get_parent_ip+0x11/0x50
>  [<ffffffff81651919>] ? sub_preempt_count+0x79/0xd0
>  [<ffffffff811ad4da>] ? fget_light+0x3ca/0x500
>  [<ffffffff811dd90d>] sys_vmsplice+0x9d/0x210
>  [<ffffffff81655937>] ? sysret_check+0x1b/0x56
>  [<ffffffff81326f3e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
>  [<ffffffff81655912>] system_call_fastpath+0x16/0x1b
> Code: e8 58 ac fb ff e9 a8 fe ff ff 0f 0b 4d 8b 6d 30 e9 fe fd ff ff 4c 89 f1 48 89 da 4c 89 ee 4c 89 e7 e8 91 fd 4a 00 e9 87 fe ff ff <0f> 0b 55 48 89 e5 53 48 83 ec 08 66 66 66 66 90 48 89 fb 48 8b 
> RIP  [<ffffffff811945ce>] kfree+0x26e/0x270
>  RSP <ffff880104065c48>
> ---[ end trace 77573bf4cc1dedea ]---
> 
> 
> That's...
> 
> 
> 3473         if (unlikely(!PageSlab(page))) {
> 3474                 BUG_ON(!PageCompound(page));
> 

Thanks Dave, I'll take a look today on this report.


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